hantdz on science museum reopen at new home in april. so admission at the old building is free for now. dan looks back at the report. >> palless of fine arts originally built for the 1915 panama pacific exposition. it was made to lack like an ancient ruin with huge display hall alongside it. half century later that hall would be reborn as revolutionary new museum. >> tornado t.you help mick a tornado. >>reporter: man with the idea was frank oppenheimer. >> whole point of the exploratorium is to make it possible for people to feel they can understand the world around them. i think a lot of people have given up with that understanding. >> frank was a brilliant physicist and educator. he died in 1985 but legacy is intensely alive both in the museum itself and in documentaries including one by filmmaker john els. frank pioneer of the hand on museum. instead of don't touch the exhibit, touching them was essential. at first it was a hard sell. >> really new idea. used to carry an exhibit around in the truching of the car to show people what he